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000902581 1001_ $$0P:(DE-HGF)0$$aWimmer, Stefan$$b0
000902581 245__ $$aMn‐Rich MnSb 2 Te 4 : A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45–50 K
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000902581 520__ $$aFerromagnetic topological insulators exhibit the quantum anomalous Hall effect, which is potentially useful for high-precision metrology, edge channel spintronics, and topological qubits.  The stable 2+ state of Mn enables intrinsic magnetic topological insulators. MnBi2Te4 is, however, antiferromagnetic with 25 K Néel temperature and is strongly n-doped. In this work, p-type MnSb2Te4, previously considered topologically trivial, is shown to be a ferromagnetic topological insulator for a few percent Mn excess. i) Ferromagnetic hysteresis with record Curie temperature of 45–50 K, ii) out-of-plane magnetic anisotropy, iii) a 2D Dirac cone with the Dirac point close to the Fermi level, iv) out-of-plane spin polarization as revealed by photoelectron spectroscopy, and v) a magnetically induced bandgap closing at the Curie temperature, demonstrated by scanning tunneling spectroscopy (STS), are shown. Moreover, a critical exponent of the magnetization β ≈ 1 is found, indicating the vicinity of a quantum critical point. Ab initio calculations reveal that Mn–Sb site exchange provides the ferromagnetic interlayer coupling and the slight excess of Mn nearly doubles the Curie temperature. Remaining deviations from the ferromagnetic order open the inverted bulk bandgap and render MnSb2Te4 a robust topological insulator and new benchmark for magnetic topological insulators.
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000902581 7001_ $$00000-0001-9947-6700$$aSánchez-Barriga, Jaime$$b1
000902581 7001_ $$0P:(DE-HGF)0$$aKüppers, Philipp$$b2
000902581 7001_ $$00000-0002-2388-6006$$aNey, Andreas$$b3
000902581 7001_ $$00000-0002-6981-2301$$aSchierle, Enrico$$b4
000902581 7001_ $$00000-0002-7170-975X$$aFreyse, Friedrich$$b5
000902581 7001_ $$00000-0001-5626-031X$$aCaha, Ondrej$$b6
000902581 7001_ $$00000-0001-6231-0061$$aMichalička, Jan$$b7
000902581 7001_ $$00000-0003-4787-0129$$aLiebmann, Marcus$$b8
000902581 7001_ $$00000-0002-5815-3742$$aPrimetzhofer, Daniel$$b9
000902581 7001_ $$00000-0002-8426-725X$$aHoffman, Martin$$b10
000902581 7001_ $$00000-0003-4005-6781$$aErnst, Arthur$$b11
000902581 7001_ $$00000-0001-5775-3386$$aOtrokov, Mikhail M.$$b12
000902581 7001_ $$0P:(DE-Juel1)130545$$aBihlmayer, Gustav$$b13
000902581 7001_ $$00000-0002-2141-0944$$aWeschke, Eugen$$b14
000902581 7001_ $$00000-0003-0034-0964$$aLake, Bella$$b15
000902581 7001_ $$00000-0002-3957-3178$$aChulkov, Evgueni V.$$b16
000902581 7001_ $$00000-0002-3993-6880$$aMorgenstern, Markus$$b17
000902581 7001_ $$0P:(DE-HGF)0$$aBauer, Günther$$b18
000902581 7001_ $$00000-0003-3133-4815$$aSpringholz, Gunther$$b19
000902581 7001_ $$00000-0003-3639-0971$$aRader, Oliver$$b20$$eCorresponding author
000902581 773__ $$0PERI:(DE-600)1474949-X$$a10.1002/adma.202102935$$gVol. 33, no. 42, p. 2102935 -$$n42$$p2102935$$tAdvanced materials$$v33$$x0935-9648$$y2021
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